CVE-2026-80670

In the Linux kernel, the following vulnerability has been resolved: perf tools: Use perf_env__get_cpu_topology() in machine__resolve() machine__resolve() accesses env->cpu[al->cpu].socket_id after checking al->cpu >= 0 and env->cpu != NULL, but without validating al->cpu against env->nr_cpus_avail. Since al->cpu comes from the untrusted perf.data sample, a crafted file with a large CPU index causes an out-of-bounds heap read. Use perf_env__get_cpu_topology() which validates both NULL and bounds. Also bounds-check al->cpu before the cast to struct perf_cpu (int16_t): without this, values like 65536 silently truncate to 0, bypassing the accessor's internal check and returning CPU 0's topology.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

• https://git.kernel.org/stable/c/5484b43a0ec8231c36fba6ead654cb72dbba8b8f
• https://git.kernel.org/stable/c/b9e8406651dcc1c19238aad11861a758683525b4
• https://git.kernel.org/stable/c/eb266a14c16a93eb4db7b56a452d6be93f8bdcd4